It's been years since I last discussed a critical work here...
Disclosure: I have translated Ayatsuji Yukito's Jukkakan no Satsujin/The Decagon House Murders and Abiko Takemaru's 8 no Satsujin/The 8 Mansion Murders to English. I have also translated the Shimada Souji short story The Running Dead.
Hankou Genba no Tsukurikata ("How to Make A Crime Scene", 2006) was written by Yasui Toshio, an architect with a love for the mystery genre. The book was received very well upon release, becoming a finalist for the Mystery Writers of Japan Award for critical works of that year, and it also led to collaborative works with Arisugawa Alice: Yasui actually designed the building featured in Arisugawa's Jooukoku no Shiro, and they also wrote a volume on locked room mysteries together. But anyway, back to this book. In this critical work, Yasui examines the (main) crime scenes from well-known mystery novels from the viewpoint of his profession, and that means looking at famous locations like say, the Decagon House in a very different way than most readers will. He discusses a different book in each chapter and starts examining each location (a building) based on the description in the work itself, as well as using the provided floorplans/diagrams to present a clear picture of said location. And then comes the interesting part: as he examines these buildings as an architect, he starts looking at things like whether the building would actually comply to Japanese laws, or whether it would actually be physically possible to create a building as described, or would it tumble over? For example, would a 'crooked house' with slanting floors be legal to build in the first place? Or where do all the drainage pipes and lines go in all those huge manors with dozens of guests rooms? Here we have an architect who is not worried about whether a murder trick using a house would be feasible: he is looking whether the location itself makes sense, which is a fresh way to look at the locations in the genre.
In this book, Yasui discusses the (main) locations of, among others, Ayatsuji Yukito's Jukkakan no Satsujin/The Decagon House Murders, Abiko Takemaru's 8 no Satsujin/The 8 Mansion Murders, Shimada Souji's Nanameyashiki no Hanzai/Murder in the Crooked House, Higashino Keigo's Juujiyashiki no Pierrot ("The Clown in The Cross Mansion"), Yokomizo Seishi's Honjin Satsujin Jiken/The Honjin Murders and Edogawa Rampo's Sankakukan no Kyoufu ("The Terror of Triangle Manor") (= rewritten version of Roger Scarlett's Murder Among the Angells). Do note that I have not actually read the complete book, as I skipped the chapters on books I have not read yet. While Yasui's focus is on the architectural importance of these books,
in a few cases, the building itself will have certain features that are
integral to the main mystery of the book (i.e. being closely tied to the
solution), so I thought it would be wiser to skip those chapters for now in fear of spoilers. Those chapters are on Mori Hiroshi's Warawanai Suugakusha ("Mathematicians Don't Laugh" AKA Mathematical Goodbye), Utano Shougo's Nagai Ie no Satsujin ("The Murder in the Long House") and Shinoda Mayumi's Kuroi Megami ("The Dark Goddess").
Anyway, the focus is thus not actually on the mysteries of each book, and most chapters follow the same format: we see Yasui first following the descriptions of each building as described in the book, using the available floorplans if provided in said book. He'll use these descriptions of for example room layouts or how people move about in the house to estimate the sizes of each building, and give a ballpark figure for how much constructing the building in question might cost. And then comes the more interesting part: he starts looking for weird things that stand out to him as an architect. As most of the authors discussed in the book are not actually architects, they might overlook issues that real architects deal with (building codes/laws, among others) and Yasui often succeeds in pointing out little things that you are likely to overlook yourself. Often, it has no real bearing on the mystery plot of each book, but it's still funny to see someone examine a mystery novel from a completely different point of view.
In his chapter on Jukkakan no Satsujin/The Decagon House Murders for example, Yasui first uses the book's own description of the titular building to create his own diagrams based on those descriptions and the floorplans provided in the book. He estimaties the exact sizes of the building in a clever way: in the book two characters are working on a rather large jigsaw puzzle in one of the rooms (which all have the same size, as the rooms form a decagon together), so with the knowledge a room has enough space to not only hold a bed/desk/closet, but should also allow for one or two people to work on a jigsaw puzzle with pieces scattered around, Yasui manages to make a realistic estimate of the sizes of the house. Once he's done with his model of the house, he points out that the building would be quite difficult to build, as it completely lacks support pillars for the roof at the places where a normal building would have them. Nothing that would immediately impact the story, but still an interesting thing that is pointed out. In fact, he calls it the biggest mystery of the Decagon House! He also makes an estimate of how much it'd cost to build the Decagon House (in Japan, in 2006), for those interested in building a decagonal house (funnily enough, his estimate does specify you'd need to procure your own island somehow).
Other chapters follow a similar pattern, where Yasui first faithfully follows the book's description of the house, and then the questions follow. 8 no Satsujin/The 8 Mansion Murders for example has Yasui moving the furniture in the guest rooms, as it feels very weird for him to have a bed next to the window for various reasons, like safety, while he also estimates the width of the gallery in the house, using the fact ground floor rooms require direct sunlight via the courtyard, meaning the gallery can only be so wide before it blocks sunlight. Higashino's Juujiyashiki no Pierrot ("The Clown in The Cross Mansion") is set in a house where one of its inhabitants is in a wheelchair, so a lot of attention in the relevant chapter is paid to the dimensions needed to allow for the girl to be able to move freely in the house in her wheelchair. The chapter on Honjin Satsujin Jiken/The Honjin Murders focuses on the traditional Japanese building details of the book, while the chapter on Nanameyashiki no Hanzai/Murder in the Crooked House asks some really interesting questions about the house that usually won't bother you during a read, like the question of how much it would've cost to give all those guest rooms their own bathrooms/toilets, as that means a lot of plumbing! He also points out the building has no communal toilet, meaning the person in the tower room has no toilet to use. One interesting point for people who have read the English translation of this book is that the English version apparently changed something: in the original Japanese, there's also no kitchen marked on the diagram of the house, which puzzles Yasui greatly of course. The English diagram actually marks a section in the diagram as the kitchen, even though it wasn't the kitchen in the original Japanese!
Anyway, like most critical works on mystery fiction, Hankou Genba no Tsukurikata is probably best read if you have already read all the books featured here, or if you don't care at all about spoilers. On the whole however, it is quite fun as a read, as it is quite different from the usual genre critical work. Because most people will have some knowledge about architecture (simply by living in buildings), Yasui's points usually make a lot of sense, as he writes in a very accessible manner and doesn't fret too much about construction details, instead pointing out things you and I will understand from a livability POV.